A sharp knife can more easily cut objects than can a dull knife because
A) a greater force can be applied with a sharp knife.
B) a greater pressure can be applied with a sharp knife.
C) dull knives cannot apply large forces.
D) sharp knives have edges that can fit between the molecules of the object.

Question

Quizplus · Accepted Answer

A sharp knife has a thinner edge which reduces the surface area in contact with the object being cut. This reduces the pressure required to cut through the object, making it easier to cut. A dull knife, on the other hand, has a wider edge, which means more surface area in contact with the object being cut, requiring more force to cut through it. Therefore, a greater pressure can be applied with a sharp knife, making it easier to cut objects.

A Sharp Knife Can More Easily Cut Objects Than Can